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acinetobacter baumannii

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https://www.readbyqxmd.com/read/29145853/molecular-characterization-of-%C3%AE-lactamase-genes-in-clinical-isolates-of-carbapenem-resistant-acinetobacter-baumannii
#1
Kevin M Raible, Bhaswati Sen, Nancy Law, Tiffany E Bias, Christopher L Emery, Garth D Ehrlich, Suresh G Joshi
BACKGROUND: Acinetobacter baumannii is a nosocomial pathogen which is establishing as a major cause of morbidity and mortality within the healthcare community. The success of this pathogen is largely due to its ability to rapidly gain resistance to antimicrobial therapies and its capability to persist in an abiotic environment through the production of a biofilm. Our tertiary-care hospital has showed high incidence of carbapenem-resistant Acinetobacter baumannii (CRAB) isolates. METHODS: In this study we explore both genotypic and phenotypic properties of 26 CRAB isolates: 16 isolates were collected from January 2010 to March 2011, and 10 were collected between February and May 2015...
November 16, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/29144725/inhibition-of-acinetobacter-derived-cephalosporinase-adc-exploring-the-carboxylate-recognition-site-using-novel-%C3%AE-lactamase-inhibitors
#2
Emilia Caselli, Chiara Romagnoli, Rachel A Powers, Magdalena A Taracila, Alexandra A Bouza, Hollister C Swanson, Kali A Smolen, Francesco Fini, Bradley J Wallar, Robert A Bonomo, Fabio Prati
Boronic acids are attracting a lot of attention as -lactamase inhibitors, and in particular compound S02030 (Ki = 44 nM) proved to be a good lead compound against ADC-7 (Acinetobacter Derived Cephalosporinase), one of the most significant resistance determinants in A. baumannii. The atomic structure of the ADC-7/S02030 complex highlighted the importance of critical structural determinants for recognition of the boronic acids. Herein, to elucidate the role in recognition of the R2-carboxylate, which mimics the C3/C4 found in -lactams, we designed, synthesized, and characterized six derivatives of S02030 (3a)...
November 16, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/29144724/structure-based-analysis-of-boronic-acids-as-inhibitors-of-acinetobacter-derived-cephalosporinase-7-adc-7-a-unique-class-c-%C3%AE-lactamase
#3
Alexandra A Bouza, Hollister C Swanson, Kali A Smolen, Alison L VanDine, Magdalena A Taracila, Chiara Romagnoli, Emilia Caselli, Fabio Prati, Robert A Bonomo, Rachel A Powers, Bradley J Wallar
Acinetobacter baumannii is a multidrug resistant pathogen that infects more than 12,000 patients each year in the US. Much of the resistance to β-lactam antibiotics in Acinetobacter spp. is a result of class C β-lactamases known as Acinetobacter-derived cephalosporinases (ADCs). ADCs are unaffected by clinically used -lactam-based β-lactamase inhibitors. In this study, five boronic acid transition state analog inhibitors (BATSIs) were evaluated for inhibition of the class C cephalosporinase ADC-7. Our goal was to explore the properties of BATSIs designed to probe the R1 binding site...
November 16, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/29142299/the-immunomodulatory-drug-glatiramer-acetate-is-also-an-effective-antimicrobial-agent-that-kills-gram-negative-bacteria
#4
Stig Hill Christiansen, Ronan A Murphy, Kristian Juul-Madsen, Marlene Fredborg, Michael Lykke Hvam, Esben Axelgaard, Sandra M Skovdal, Rikke Louise Meyer, Uffe B Skov Sørensen, Arne Möller, Jens Randel Nyengaard, Niels Nørskov-Lauritsen, Mikala Wang, Mihaela Gadjeva, Kenneth A Howard, Jane C Davies, Eskild Petersen, Thomas Vorup-Jensen
Classic drug development strategies have failed to meet the urgent clinical needs in treating infections with Gram-negative bacteria. Repurposing drugs can lead to timely availability of new antibiotics, accelerated by existing safety profiles. Glatiramer acetate (GA) is a widely used and safe formulation for treatment of multiple sclerosis. It contains a large diversity of essentially isomeric polypeptides with the cationic and amphiphilic character of many antimicrobial peptides (AMP). Here, we report that GA is antibacterial, targeting Gram-negative organisms with higher activity towards Pseudomonas aeruginosa than the naturally-occurring AMP LL-37 in human plasma...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141401/-simulation-of-an-outbreak-of-acinetobacter-baumannii-in-hospitals
#5
A Martín-Del Rey, M García-Moro, E García-Sánchez, E García-Merino, J E García-Sánchez
OBJECTIVE: Acinetobacter baumannii infections have increased over time becoming a significant issue. Consequently, those applications that allow to predict the evolution of an outbreak and the relevance of the different control methods, are very important. The design of mathematical models plays a central role in this topic. METHODS: Development of a deterministic mathematical model based on ordinary differential equations whose variables and parameters are defined upon the basis of knowledge of the epidemiology and characteristics of A...
November 13, 2017: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
https://www.readbyqxmd.com/read/29138321/in-vivo-bioluminescence-imaging-of-labile-iron-accumulation-in-a-murine-model-of-acinetobacter-baumannii-infection
#6
Allegra T Aron, Marie C Heffern, Zachery R Lonergan, Mark N Vander Wal, Brian R Blank, Benjamin Spangler, Yaofang Zhang, Hyo Min Park, Andreas Stahl, Adam R Renslo, Eric P Skaar, Christopher J Chang
Iron is an essential metal for all organisms, yet disruption of its homeostasis, particularly in labile forms that can contribute to oxidative stress, is connected to diseases ranging from infection to cancer to neurodegeneration. Iron deficiency is also among the most common nutritional deficiencies worldwide. To advance studies of iron in healthy and disease states, we now report the synthesis and characterization of iron-caged luciferin-1 (ICL-1), a bioluminescent probe that enables longitudinal monitoring of labile iron pools (LIPs) in living animals...
November 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29137647/new-eight-genes-identified-at-the-clinical-multidrug-resistant-acinetobacter-baumannii-dms06669-strain-in-a-vietnam-hospital
#7
Nguyen Si-Tuan, Hua My Ngoc, Pham Thi Thu Hang, Cuong Nguyen, Pham Hung Van, Nguyen Thuy Huong
BACKGROUND: Acinetobacter baumannii is an important nosocomial pathogen that can develop multidrug resistance. In this study, we characterized the genome of the A. baumannii strain DMS06669 (isolated from the sputum of a male patient with hospital-acquired pneumonia) and focused on identification of genes relevant to antibiotic resistance. METHODS: Whole genome analysis of A. baumannii DMS06669 from hospital-acquired pneumonia patients included de novo assembly; gene prediction; functional annotation to public databases; phylogenetics tree construction and antibiotics genes identification...
November 14, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/29137129/design-and-evaluation-of-novel-polymyxin-fluorescent-probes
#8
Bo Yun, Kade D Roberts, Philip E Thompson, Roger L Nation, Tony Velkov, Jian Li
Polymyxins (polymyxin B and colistin) are cyclic lipopeptide antibiotics that serve as a last-line defence against Gram-negative "superbugs". In the present study, two novel fluorescent polymyxin probes were designed through regio-selective modifications of the polymyxin B core structure at the N-terminus and the hydrophobic motif at positions 6 and 7. The resulting probes, FADDI-285 and FADDI-286 demonstrated comparable antibacterial activity (MICs 2-8 mg/L) to polymyxin B and colistin (MICs 0.5-8 mg/L) against a panel of gram-negative clinical isolates of Acinetobacter baumannii, Klebsiella pneumoniae and Pseudomonas aeruginosa...
November 11, 2017: Sensors
https://www.readbyqxmd.com/read/29136469/novel-linear-lipopeptide-paenipeptins-with-potential-for-eradicating-biofilms-and-sensitizing-gram-negative-bacteria-to-rifampicin-and-clarithromycin
#9
Sun Hee Moon, Xuan Zhang, Guangrong Zheng, Daniel G Meeker, Mark S Smeltzer, En Huang
We report the structure-activity relationship (SAR) analyses of 17 linear lipopeptide paenipeptin analogues. Analogues 7, 12 and 17 were more potent than the lead compound. Analogue 17 was active against carbapenem-resistant and polymyxin-resistant pathogens. This compound at 40 μg/mL resulted in 3 log and 2.6 log reductions of methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa, respectively, in catheter-associated biofilms in vitro. Analogue 17 showed little hemolysis at 32 µg/ml and lysed 11% of red blood cells at 64 µg/ml...
November 14, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29133567/risk-factors-and-outcomes-associated-with-multidrug-resistant-acinetobacter-baumannii-upon-icu-admission
#10
Natalia Blanco, Anthony D Harris, Clare Rock, J Kristie Johnson, Lisa Pineles, Robert A Bonomo, Arjun Srinivasan, Melinda M Pettigrew, Kerri A Thom
Introduction: Multi-drug resistant (MDR) Acinetobacter baumannii, associated with broad-spectrum antibiotic use, is an important nosocomial pathogen associated with morbidity and mortality. This study aimed to investigate the prevalence of MDR A. baumannii perirectal colonization among adult patients at ICU admission over a 5-year period, and to identify risk factors and outcomes associated with colonization.Methods: A retrospective cohort analysis of patients admitted to the medical (MICU) and surgical intensive care units (SICU) at the University of Maryland Medical Center from May 2005 to September 2009 was performed using perirectal surveillance cultures on admission...
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29133555/the-frequency-and-mechanism-of-spontaneous-resistance-to-sulbactam-combined-with-the-novel-%C3%AE-lactamase-inhibitor-etx2514-in-clinical-isolates-of-acinetobacter-baumannii
#11
Sarah M McLeod, Adam B Shapiro, Samir H Moussa, Michele Johnstone, Robert E McLaughlin, Boudewijn L M de Jonge, Alita A Miller
The novel diazabicyclooctenone ETX2514 is a potent, broad spectrum serine β-lactamase inhibitor that restores sulbactam activity against resistant Acinetobacter baumannii. The frequency of spontaneous resistance to sulbactam-ETX2514 in clinical isolates was found to be 7.6x10(-10) to <9.0x10(-10) at 4x MIC and mapped to residues near the active site of PBP3. Purified mutant PBP3 proteins demonstrated reduced affinity for sulbactam. In a sulbactam-sensitive isolate, resistance also mapped to stringent response genes associated with resistance to PBP2 inhibitors, suggesting that, in addition to β-lactamase inhibition, ETX2514 may also enhance sulbactam activity in A...
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29133159/highly-conserved-exposed-immunogenic-peptides-of-omp34-against-acinetobacter-baumannii-an-innovative-approach
#12
Abolfazl Jahangiri, Iraj Rasooli, Parviz Owlia, Abbas Ali Imani Fooladi, Jafar Salimian
Omp34, also known as Omp34kDa or Omp33-36 is a virulence factor associated with A. baumannii metabolic fitness or its adherence and invasion to human epithelial cells. This protein is also introduced as a specific antigen which could induce strong antibody responses. In the present in silico study, recent vaccine design strategies such as 'antigen minimization' and 'high epitope density' were invoked to design a soluble immunogen with higher antigenicity. As an advantage, the tools employed in the current study are easily available...
November 10, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29127419/bacteremic-and-non-bacteremic-pneumonia-caused-by-acinetobacter-baumannii-in-icus-of-south-china-a-clinical-and-microbiological-study
#13
Yunfang Tan, Kai Zhou, Xiang Tang, Timothy Kudinha, Luxia Wang, Zhenghui Guo, Murat Akova, Chao Zhuo
Acinetobacter baumannii has been a dreadful problem for ICU physicians for a long time. Bacteremic pneumonia (BP) caused by this organism has a higher mortality compared to other organisms. Between 2012 and 2015, 86 BP and 89 non-bacteremic pneumonia (NBP) patients from five ICUs were enrolled into the study. The 7-day and 14-day mortality rates were higher in BP patients than in NBP patients (P < 0.001). Procalcitonin elevation, high APACHEII score and recent surgery, were independently associated with BP episodes...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29127051/genomic-analysis-of-in-vivo-acquired-resistance-to-colistin-and-rifampin-in-acinetobacter-baumannii
#14
Nadia Jaidane, Thierry Naas, Wejdene Mansour, Bechir Ben Radhia, Sofiene Jerbi, Noureddine Boujaafar, Olfa Bouallegue, Rémy A Bonnin
Acinetobacter baumannii is an opportunistic pathogen in health-care facilities responsible for nosocomial infections mostly in immune-compromised patients. Colistin resistance is increasingly reported worldwide in that species. We describe here in vivo selection of colistin and rifampin resistance in a carbapenem-resistant A. baumannii (Ab). Antimicrobial susceptibility testing, plasmid analysis, and Whole Genome Sequencing (WGS) were performed to fully characterize the resistome of AbS1 and AbS2 clinical isolates...
November 7, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29124876/trehalose-a-temperature-and-salt-induced-solute-with-implications-in-pathobiology-of-acinetobacter-baumannii
#15
Sabine Zeidler, Josephine Hubloher, Kim Schabacker, Pedro Lamosa, Helena Santos, Volker Müller
Acinetobacter baumannii is an opportunistic human pathogen that has become a global threat to healthcare institutions worldwide. A major factor contributing to success of this bacterium is its outstanding ability to survive on dry surfaces. The molecular basis for desiccation resistance is not completely understood. This study focused on growth under osmotic stress and aimed to identify the pool of compatible solutes synthesized in response to these low water activity conditions. A. baumannii produced mannitol as compatible solute, but in contrast to Acinetobacter baylyi, also trehalose was accumulated in response to increasing NaCl concentrations...
November 10, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/29122697/early-administration-of-appropriate-antimicrobial-agent-to-improve-the-outcome-of-carbapenem-resistant-acinetobacter-baumannii-complex-bacteremic-pneumonia
#16
Seong Yeon Park, Eun Jung Lee, Tark Kim, Shi Nae Yu, Ki-Ho Park, Mi Suk Lee, Se Yoon Park, Min Hyok Jeon, Tae Hyong Kim, Eun Ju Choo
BACKGROUND: Carbapenem resistant Acinetobacter baumannii complex (CRABC) is an emerging pathogen that causes bloodstream infections and nosocomial pneumonia. This study aimed to describe the severe infection associated with CRABC bacteremic pneumonia and to investigate risk factors for 28-day mortality. METHODS: All patients ≥18 years of age with a CRABC bacteremic pneumonia were enrolled retrospectively at five teaching hospitals in South Korea. Empirical antimicrobial therapy was defined as appropriate if administration of at least one antimicrobial agent, to which the causative pathogen was susceptible, more than 48 hours, within 5 days of the onset of bacteremia...
November 6, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29118172/multicenter-evaluation-of-the-modified-carbapenem-inactivation-method-and-the-carba-np-for-detection-of-carbapenemase-producing-pseudomonas-aeruginosa-and-acinetobacter-baumannii
#17
Patricia J Simner, J Kristie Johnson, William B Brasso, Karen Anderson, David R Lonsway, Virginia M Pierce, April M Bobenchik, Zabrina C Lockett, Angella Charnot-Katsikas, Lars F Westblade, Brian B Yoo, Stephen G Jenkins, Brandi M Limbago, Sanchita Das, Darcie E Roe-Carpenter
The purpose of this study was to develop the modified Carbapenem Inactivation Method (mCIM) for the detection of carbapenemase-producing (CP) Pseudomonas aeruginosa (PA) and Acinetobacter baumannii (AB) and perform a multicenter evaluation of the mCIM and Carba NP tests for these non-fermenters. Thirty P. aeruginosa and 30 A. baumannii isolates previously characterized by whole genome sequencing from the CDC-FDA Antibiotic Resistance Isolate Bank were evaluated, including carbapenemase-producers (CP; Ambler Class A, B, and D), non-carbapenemase-producing (non-CP) carbapenem-resistant isolates, and carbapenem-susceptible isolates...
November 8, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29116586/correction-to-acquisition-of-tn6018-3-cs-regions-increases-colistin-mics-against-acinetobacter-baumannii-isolates-harboring-new-variants-of-abars
#18
Mohammad Savari, Alireza Ekrami, Saeed Shoja, Abbas Bahador
The published online version of this article contained a mistake. The correct affiliation of Alireza Ekrami should have been "Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran" . The authors regret this error.
November 7, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/29115647/clinical-infection-in-burn-patients-and-its-consequences
#19
Cem Emir Güldoğan, Murat Kendirci, Deniz Tikici, Emre Gündoğdu, Ahmet Çınar Yastı
BACKGROUND: Burn injuries facilitate invasive infections and sepsis not only by destroying the continuity of the protective skin barrier but also through systemic effects. The burn wound, blood, and urine samples are frequently cultured to determine the pathogen agent. The aim of this study was to analyze pathogen growth in patients' cultures confirmed as "infection positive" by the hospital Infection Control Committee and to assess the clinical implications of these growths. METHODS: Hospitalized patients included in the study were those with a total burned body surface area of >10% and "presence of infection" confirmed by the Infection Control Committee...
November 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/29114953/expanding-the-paradigm-for-the-outer-membrane-acinetobacter-baumannii-in-the-absence-of-endotoxin
#20
REVIEW
Matthew Joseph Powers, M Stephen Trent
Asymmetry in the outer membrane has long defined the cell envelope of Gram-negative bacteria. This asymmetry, with lipopolysaccharide (LPS) or lipooligosaccharide (LOS) exclusively in the outer leaflet of the membrane, establishes an impermeable barrier that protects the cell from a number of stressors in the environment. Work done over the past 5 years has shown that Acinetobacter baumannii has the remarkable capability to survive with inactivated production of lipid A biosynthesis and the absence of LOS in its outer membrane...
November 8, 2017: Molecular Microbiology
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